Algebraic Frames for the Perception-Action Cycle
@Book{sommer97afpacband,
  title = 	 {Algebraic Frames for the Perception--Action Cycle},
  year = 	 1997,
  editor =	 {G. Sommer and J.J. Koenderink},
  volume =	 1315,
  series =	 {Lecture Notes in Computer Science},
  publisher =	 {Springer--Verlag, Heidelberg},
  booktitle = {Int. Workshop, AFPACŽ97, Kiel},
  month =	 {September}
}